Radio antenna



Sept 6, 1932 D. c. SENTER ET AL 1,876,318

RADIO ANTENNA Filed' Aug. 1, 195o 720mb, .f4 TTORNEY Patented Sept. 6,1932 UNITED vs'la'rflas DANIEL c. sENrER AND ANDREW F. SENTER; ore'nAivDvrEu/"r,Y Missounr t RADIO ANTENNAy Application mea August 1,193e. serial 310.472.241. A

Our invention relates to improvements in radio antennae. w

It is particularly well adapted for the interception of subterraneanwaves.

5 One of the objects of our invention is` the e provision of a novelaerial of the kind'described, which is simple, cheap, durable, not

likely togetk out of order, which requires no elevated supports, whichcan be buried in the receiving set, which largely eliminates staticdisturbances and many other disturbances and distortions which occurwith the use of elevated aerials, and with which the naturalness of theoriginal tones is retained.V

The novel features of our invention are hereinafter fully described andclaimed.

In the accompanying drawing, which illustrates the preferred embodimentof our invention, i

Fig. 1 is a central vertical sectional view of our imp-roved radioaerial.

Fig. 2 is a side elevation, partly broken away, of the same.

Fig. 3 is a section on the line 3 3 of Fig. 1.

Fig. 4 is a top view, partly broken away of our improved aerial.

Fig. 5 is a diagrammatic view of the circuit arrangement of our improvedaerial. 30 Similar characters of reference designate similar parts inthe diiferent views.

1 designates the tubular body of a core having a cover 2 and providingan air tight chamber 8. The body 1 and cover 2 are, preferably,non-magnetic and non-conductive, and may be of glass, vulcanized fibre,or other suitable material.

We provide an electric conductor, which includes in series a loop 4 inthe chamber 3 and having one arm connected to a binding post 5 mountedon the cover 2, the other arm of said loop being connected to oneterminal of an insulated inductance winding 6, which encirclesthe bodyland the other terminal of which is connected to a conductor 7 which isadapted to be grounded. Connected to the binding post 5 is a conductor 8which is adapted to be connected with the input of a 50 radio receivingset, not shown.

A fixed condenser 9, preferably of about ber of layers may be varied.

i@ ground or included in the casing of a radio -cover 2, when the aerialis to be buried in the is to be used.

.0025 is .connectedv across the arms ofthe loop 4 byr two conductors 10`and 11 which are respectively connected to one arm of the loop 4 and tothejbinding post 5 which is attached to the other arm of the loop.

'Ihe winding 6 is preferably composed of about 100 feet of insulatedwire wound in three layers, although the length and num- The ,winding 6and the core body 1 and ground, are embedded in a suitablenon-conductive,'nonmagnetic material 12, preferably sealing waX, ywaxo-r other substance which will afford a water proof covering for thewinding-'6.

In use, the conductor 7 is grounded and the conductor 8 is connected tothe input bindingV post of the set with which the aerial With the use ofour improved aerial, the

yreception is verystrong, clear, natural in tone, and remarkably freefrom the usual static disturbances, even during an electric storm, whenthe same set, used with an overhead aerial of usual type would emit alarge amount of static produced sounds.

lThe loop 4 is disposed in the winding 6 so as to be inductively relatedthereto. By embedding the winding 6 in sealing wax or similar material,a casing is provided, which is non-magnetic, non-conductive, whichserves to hold the coils of the winding 6 stationary and insulated fromeach other, which hermetically seals the interior from air and moisture,and which serves as a container for the core 1. ,y

We do not limit our invention to the structure shown and described,as'modiications, within the scope of the` appended claims, may be madewithout departing from the spirit of our invention.

What we claim is `1. In-a radio antenna, a casing composed ofvnon-magnetic insulating material impervious to water and air, aconductor the ends of which extend outside said casing, said conductorhaving anl inductance winding embedded in and insulated by the materialof said casing, said conductor having a loop extending into and spacedfrom and in series with said winding, and a connectionincluding acondenser between the arms of said loop.

2. In a radio antenna, a casing composed of sealing Wax, a conductorhaving an inductance winding embedded in and ,insulated by said sealingwax, the ends of said conductor extending outside said casing, saidconductor having a loop extending into, spaced Vfrom and in series withsaid winding, and a connection including a condenser between the arms ofsaid loop.

In testimony whereof we have signed our names to this specification. YDANIEL C. SENTER. 1 ANDREW F. 'SEN'IER

